Thanks Divster for the tip on the battery operated whisk.
BuxomBarrister you made me laugh with your 'super quick' instructions - I think I need to find a better way, lol!
Having had a 'kitchen disaster' last week trying to turn my chocolate shake into hot chocolate, I knew not to add boiling water to my blender bottle! Today I experimented with about 100ml cold water & the soup powder, shake until smooth & pour into mug, then top up with hot water from the kettle. It's still a bit of a faff but getting better!
Thanks everyone x